/Engine/Source/Editor/UnrealEd/Public/Layers/LayersSubsystem.h
Removes an actor from the specified layer.
true if the actor was removed from the layer. false is returned if the actor already belonged to the layer.
virtual bool RemoveActorFromLayer ( [AActor](API\Runtime\Engine\GameFramework\AActor) * Actor, const [FName](API\Runtime\Core\UObject\FName) & LayerToRemove, const bool bUpdateStats )